Will post fully later, but feel like playing around a bit here...
Godlike
Tyr (BoFs) vs Rubicant (FF4) - Random thinkings for this one from a curiosity perspective.
Rubicante deals...2000 to a 1050 average or so.
Tyr 1 Hydra deals about 150 to a 999 average (Agni) or 200 to a 400 average without Agni? Levels will vary for this a bit, I suppose. I'd take Tyr Hydra against Agni definitely, so if we go with Myria 1 Girl...
*Looks, sees no notes for it*
...ok, I know she had Chill, so that's 100 damage or so to the same average. Durability-wise, assuming Agni, Tyr 1 Hydra is 31x or so (999 per turn average damage) and Tyr Girl is 25000 HP vs. about 1500 damage (BoltX, Star Hammer, Rudra, Puka...probably using marbles for crits), which makes her 16.7x to me, or...25000/(1500*4) 4.16x...honestly, I don't know how the majority of you do the HP boss thing, so this could be completely wrong, but whatever. Tyr girl is dealing 1-shotable damage to PC average in BoF assuming the weakness kicks in for Rubicante (100*4 = 400, which is about where I'd see the average lying). Rubicante is 34000 HP to an average of about 1000 nixing weakness effects, so 34x or 8.5x...or whatever depending on how you look at it.
....wow, that's a weird way to math it. Taking into account his weakness, he's 8.5x and 2.2x or so, which is still good, but much worse than Tyr now. Granted, with the weaknesses in effect, I wouldn't see Tyr Girl's Chill having an effect of weakness blasting on him, so...Rubicante still probably wins that. However, depending on if you assume Agni in the Tyr Hydra fight...that might be the clincher. Look at my perspective here, and it's...extremely close.